lru_add_drain query

[Ray Bryant <raybry@sgi.com>]

The deferred lru_add operations (e. g. lru_cache_add_active()) defer the
actual addition of a page to the lru list until a batch of such additions
are available.  lru_cache_add_active() uses a per cpu variable 
(lru_add_active_pvecs) to hold the deferred pages.

So, to get the deferred adds to complete (so that the lru list is in a
consistent state and we can scan lru list to do some processing) one calls
lru_add_drain().  But AFAI can tell, this just drains the local cpu's
deferred add queue.  Right?

So, here's my question:  Why is it that I don't need to call lru_add_drain()
on each CPU in the system before I go scan/manipulate the lru list?  (i. e.
what about deferred adds in other CPU's lru_add_active_pvecs?)

What peice of magic am I missing here?

Thanks,

-- 
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Ray Bryant
512-453-9679 (work)         512-507-7807 (cell)
raybry@sgi.com             raybry@austin.rr.com
The box said: "Requires Windows 98 or better",
	 so I installed Linux.
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